Direct Electric Heating Of Domestic Water
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Transcript of Direct Electric Heating Of Domestic Water
-SAMARTH PAWARDR. TADUESZ CZASZEJKO
DIRECT ELECTRIC HEATING OF DOMESTIC WATER
INTRODUCTIONAIM
Heat Water by passing electric current directly through it.
Limit CurrentPrevent Electrolysis of Water
INTRODUCTION
POWER SUPPLY UNITAC source / Rectified DC
sourceCONTROLLER UNIT
HEATThermocouple
CURRENTHall Effect sensor
ELECTRODESParallel plateR=ρ*length/surface area
POWER SUPPLY
CONTROLLER
COLD
HOT
POWER SUPPLY
Low Peak to RMS ratio.Firing Angle control of thyristor.H-Bridge switching , emulating alternating
current.Low losses.
CONTROLLER SOLUTIONCONTROL PARAMETERS
Reference Current(Ir)Reference Temperature(Tr)
WATER MODEL PARAMETERSLength, Width (gap between electrodes), Height,
Resistance, Flow Rate and Initial Temperature.
Tr PI(t) PI(i)PLANT1: POWER SUPPLY
PLANT2: ELECTRODES
-1
-1
Et Ir Ei α I T
PSIM SIMULATIONS – (flow rate)
FLOW RATE = 9L/m, R=5 Ohms, Initial Temperature = 0 FLOW RATE = 7.8L/m, R=5 Ohms, Initial Temperature = 0
FLOW RATE = 6.6L/m, R=5 Ohms, Initial Temperature = 0 FLOW RATE = 0.5L/m, R=5 Ohms, Initial Temperature = 0
PSIM SIMULATIONSFLOW RATE = 9L/m, R=4 Ohms, Initial Temperature = 0 FLOW RATE = 9L/m, R=1 Ohms, Initial Temperature = 0
FLOW RATE = 9L/m, R=5 Ohms, Initial Temperature = 10 FLOW RATE = 9L/m, R=5 Ohms, Initial Temperature = 20
EXPERIMENTAL SET UP
Isolation Step Down TransformerDiode BridgeCapacitor-470uFResistor-112 Ohms Load bank setting.Dead time control
MINIMUM DEAD TIME OF 4US CLOSER TO MAXIMUM DEAD TIME
MINIMUM DEAD TIME , SHOWS RECTIFIED VOLTAGE SWITCHING VOLTAGES ACROSS THE ELECTRODES
CONCLUSIONSUniversal water heater – higher supply
voltages, support wide range of resistivity’s.
CONCLUSIONSUse of Simulation Model
Better ElectrodesDifferent components
Alternate MethodsBuck/Boost Convertor topologiesDevelopment of better inductors
Experimental Set Up can be used with electrodes with isolation.
ACKNOWLEDGMENTDr. Tadeusz CzaszejkoMr. Ian Reynolds, Mr Ray Chapman and Mr
Ray CooperSpecial thanks to David PetzerThank You Supervisors